.cityList{
    background-color: #fff;
    border-top: 1px solid #ccc;
    padding: 20px;
    li{
        border: 1px solid #ccc;
        float: left;
        width: 29%;
        text-align: center;
        height: 40px;
        line-height: 40px;
        margin-right: 20px;
        margin-top:20px;
        &:nth-child(3n){
            margin-right: 0;
        }
    }
}